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<a href="qsocket_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/******************************************************************************</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * qLibc</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Copyright (c) 2010-2015 Seungyoung Kim.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * All rights reserved.</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> *</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> * modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> *    this list of conditions and the following disclaimer.</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> *    this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> *    and/or other materials provided with the distribution.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> *</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot;</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"> * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="comment"> * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="comment"> * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="comment"> * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment"> * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="comment"> * POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment"> *****************************************************************************/</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment"></span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">/**</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> * @file qsocket.c Socket dandling APIs.</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> */</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="preprocessor">#ifndef _WIN32</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="preprocessor">#include &lt;stdbool.h&gt;</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="preprocessor">#include &lt;stdarg.h&gt;</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="preprocessor">#include &lt;netdb.h&gt;</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="preprocessor">#include &lt;fcntl.h&gt;</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="preprocessor">#include &lt;unistd.h&gt;</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="preprocessor">#include &lt;errno.h&gt;</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="preprocessor">#include &lt;arpa/inet.h&gt;</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="preprocessor">#include &lt;netinet/in.h&gt;</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="preprocessor">#include &lt;sys/socket.h&gt;</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="preprocessor">#include &quot;qinternal.h&quot;</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="preprocessor">#include &quot;utilities/qio.h&quot;</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="preprocessor">#include &quot;utilities/qstring.h&quot;</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="preprocessor">#include &quot;utilities/qsocket.h&quot;</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"></span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">/**</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> * Create a TCP socket for the remote host and port.</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> *</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * @param hostname  remote hostname</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * @param port      remote port</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> * @param timeoutms wait timeout milliseconds. if set to negative value,</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> *                  wait indefinitely.</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> *</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> * @return the new socket descriptor, or</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> *         -1 in case of invalid hostname,</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> *         -2 in case of socket creation failure,</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> *         -3 in case of connection failure.</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> */</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"><a class="line" href="qsocket_8c.html#a86e043367b6ba401408c64736192319d">   65</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="qsocket_8c.html#a86e043367b6ba401408c64736192319d">qsocket_open</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *hostname, <span class="keywordtype">int</span> port, <span class="keywordtype">int</span> timeoutms) {</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>    <span class="comment">/* host conversion */</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>    <span class="keyword">struct </span>sockaddr_in addr;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>    <span class="keywordflow">if</span> (<a class="code hl_function" href="qsocket_8c.html#a4285c6dd3c52560f3d471f332f6558bc">qsocket_get_addr</a>(&amp;addr, hostname, port) == <span class="keyword">false</span>) {</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>        <span class="keywordflow">return</span> -1; <span class="comment">/* invalid hostname */</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>    }</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>    <span class="comment">/* create new socket */</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>    <span class="keywordtype">int</span> sockfd;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>    <span class="keywordflow">if</span> ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) &lt; 0) {</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>        <span class="keywordflow">return</span> -2; <span class="comment">/* sockfd creation fail */</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>    }</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span> </div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>    <span class="comment">/* set to non-block socket*/</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>    <span class="keywordtype">int</span> flags = fcntl(sockfd, F_GETFL, 0);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>    <span class="keywordflow">if</span> (timeoutms &gt;= 0)</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>        fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>    <span class="comment">/* try to connect */</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>    <span class="keywordtype">int</span> status = connect(sockfd, (<span class="keyword">struct</span> sockaddr *) &amp;addr, <span class="keyword">sizeof</span>(addr));</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>    <span class="keywordflow">if</span> (status &lt; 0</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>            &amp;&amp; (errno != EINPROGRESS</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>                    || <a class="code hl_function" href="qio_8c.html#ac905811f0daa394ffef7beab68585a55">qio_wait_writable</a>(sockfd, timeoutms) &lt;= 0)) {</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>        close(sockfd);</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>        <span class="keywordflow">return</span> -3; <span class="comment">/* connection failed */</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>    }</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>    <span class="comment">/* restore to block socket */</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>    <span class="keywordflow">if</span> (timeoutms &gt;= 0)</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>        fcntl(sockfd, F_SETFL, flags);</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>    <span class="keywordflow">return</span> sockfd;</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>}</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment"></span> </div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">/**</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment"> * Close socket.</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"> *</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment"> * @param sockfd    socket descriptor</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment"> * @param timeoutms if timeoutms &gt;= 0, shut down write connection first then</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment"> *                  wait and throw out input stream data. set to -1 to close</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment"> *                  socket immediately.</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment"> *</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment"> * @return true on success, or false if an error occurred.</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment"> */</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"><a class="line" href="qsocket_8c.html#a536b1963c73ec5ace917a57ffed1f3cd">  109</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="qsocket_8c.html#a536b1963c73ec5ace917a57ffed1f3cd">qsocket_close</a>(<span class="keywordtype">int</span> sockfd, <span class="keywordtype">int</span> timeoutms) {</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>    <span class="comment">// close connection</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>    <span class="keywordflow">if</span> (timeoutms &gt;= 0 &amp;&amp; shutdown(sockfd, SHUT_WR) == 0) {</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>        <span class="keywordtype">char</span> buf[1024];</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>        <span class="keywordflow">while</span> (<span class="keyword">true</span>) {</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>            ssize_t read = <a class="code hl_function" href="qio_8c.html#aa34911362f1793ed1e744d3eb63500db">qio_read</a>(sockfd, buf, <span class="keyword">sizeof</span>(buf), timeoutms);</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>            DEBUG(<span class="stringliteral">&quot;Throw %zu bytes from dummy input stream.&quot;</span>, read);</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>            <span class="keywordflow">if</span> (read &lt;= 0)</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>                <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>        }</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>    }</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span> </div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>    <span class="keywordflow">if</span> (close(sockfd) == 0)</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>        <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>}</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment"></span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">/**</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment"> * Convert hostname to sockaddr_in structure.</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment"> *</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment"> * @param addr      sockaddr_in structure pointer</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment"> * @param hostname  IP string address or hostname</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment"> * @param port      port number</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment"> *</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment"> * @return true if successful, otherwise returns false.</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment"> */</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"><a class="line" href="qsocket_8c.html#a4285c6dd3c52560f3d471f332f6558bc">  135</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="qsocket_8c.html#a4285c6dd3c52560f3d471f332f6558bc">qsocket_get_addr</a>(<span class="keyword">struct</span> sockaddr_in *addr, <span class="keyword">const</span> <span class="keywordtype">char</span> *hostname, <span class="keywordtype">int</span> port) {</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>    <span class="comment">/* here we assume that the hostname argument contains ip address */</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>    memset((<span class="keywordtype">void</span> *) addr, 0, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> sockaddr_in));</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>    <span class="keywordflow">if</span> (!inet_aton(hostname, &amp;addr-&gt;sin_addr)) { <span class="comment">/* fail then try another way */</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>        <span class="keyword">struct </span>hostent *hp;</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>        <span class="keywordflow">if</span> ((hp = gethostbyname(hostname)) == 0)</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>            <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>        memcpy(&amp;addr-&gt;sin_addr, hp-&gt;h_addr, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> in_addr));</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>    }</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>    addr-&gt;sin_family = AF_INET;</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>    addr-&gt;sin_port = htons(port);</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span> </div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>}</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment"></span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment">/**</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment"> * Return local IP address.</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment"> *</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment"> * @return malloced string pointer which contains IP address string if</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment"> *         successful, otherwise returns NULL</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment"> */</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"><a class="line" href="qsocket_8c.html#aefe8cc8f14190e19e81d9ec090007bd2">  156</a></span><span class="keywordtype">char</span> *<a class="code hl_function" href="qsocket_8c.html#aefe8cc8f14190e19e81d9ec090007bd2">qsocket_get_localaddr</a>(<span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> bufsize) {</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>    <span class="keywordtype">char</span> hostname[63 + 1];</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>    <span class="keywordflow">if</span> (gethostname(hostname, <span class="keyword">sizeof</span>(hostname)) != 0)</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span>        <span class="keywordflow">return</span> NULL;</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span> </div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span>    <span class="keyword">struct </span>hostent *hostentry = gethostbyname(hostname);</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>    <span class="keywordflow">if</span> (hostentry == NULL)</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>        <span class="keywordflow">return</span> NULL;</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span> </div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>    <span class="keywordtype">char</span> *localip = inet_ntoa(*(<span class="keyword">struct</span> in_addr *) *hostentry-&gt;h_addr_list);</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>    <span class="keywordflow">if</span> (localip == NULL)</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>        <span class="keywordflow">return</span> NULL;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span> </div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>    <a class="code hl_function" href="qstring_8c.html#a24dcde4b707ed664b3962e1bf400de0f">qstrcpy</a>(buf, bufsize, localip);</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>    <span class="keywordflow">return</span> buf;</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span>}</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span> </div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="preprocessor">#endif </span><span class="comment">/* _WIN32 */</span><span class="preprocessor"></span></div>
<div class="ttc" id="aqio_8c_html_aa34911362f1793ed1e744d3eb63500db"><div class="ttname"><a href="qio_8c.html#aa34911362f1793ed1e744d3eb63500db">qio_read</a></div><div class="ttdeci">ssize_t qio_read(int fd, void *buf, size_t nbytes, int timeoutms)</div><div class="ttdoc">Read from a file descriptor.</div><div class="ttdef"><b>Definition</b> <a href="qio_8c_source.html#l00118">qio.c:118</a></div></div>
<div class="ttc" id="aqio_8c_html_ac905811f0daa394ffef7beab68585a55"><div class="ttname"><a href="qio_8c.html#ac905811f0daa394ffef7beab68585a55">qio_wait_writable</a></div><div class="ttdeci">int qio_wait_writable(int fd, int timeoutms)</div><div class="ttdoc">Test &amp; wait until the file descriptor is ready for writing.</div><div class="ttdef"><b>Definition</b> <a href="qio_8c_source.html#l00087">qio.c:87</a></div></div>
<div class="ttc" id="aqsocket_8c_html_a4285c6dd3c52560f3d471f332f6558bc"><div class="ttname"><a href="qsocket_8c.html#a4285c6dd3c52560f3d471f332f6558bc">qsocket_get_addr</a></div><div class="ttdeci">bool qsocket_get_addr(struct sockaddr_in *addr, const char *hostname, int port)</div><div class="ttdoc">Convert hostname to sockaddr_in structure.</div><div class="ttdef"><b>Definition</b> <a href="qsocket_8c_source.html#l00135">qsocket.c:135</a></div></div>
<div class="ttc" id="aqsocket_8c_html_a536b1963c73ec5ace917a57ffed1f3cd"><div class="ttname"><a href="qsocket_8c.html#a536b1963c73ec5ace917a57ffed1f3cd">qsocket_close</a></div><div class="ttdeci">bool qsocket_close(int sockfd, int timeoutms)</div><div class="ttdoc">Close socket.</div><div class="ttdef"><b>Definition</b> <a href="qsocket_8c_source.html#l00109">qsocket.c:109</a></div></div>
<div class="ttc" id="aqsocket_8c_html_a86e043367b6ba401408c64736192319d"><div class="ttname"><a href="qsocket_8c.html#a86e043367b6ba401408c64736192319d">qsocket_open</a></div><div class="ttdeci">int qsocket_open(const char *hostname, int port, int timeoutms)</div><div class="ttdoc">Create a TCP socket for the remote host and port.</div><div class="ttdef"><b>Definition</b> <a href="qsocket_8c_source.html#l00065">qsocket.c:65</a></div></div>
<div class="ttc" id="aqsocket_8c_html_aefe8cc8f14190e19e81d9ec090007bd2"><div class="ttname"><a href="qsocket_8c.html#aefe8cc8f14190e19e81d9ec090007bd2">qsocket_get_localaddr</a></div><div class="ttdeci">char * qsocket_get_localaddr(char *buf, size_t bufsize)</div><div class="ttdoc">Return local IP address.</div><div class="ttdef"><b>Definition</b> <a href="qsocket_8c_source.html#l00156">qsocket.c:156</a></div></div>
<div class="ttc" id="aqstring_8c_html_a24dcde4b707ed664b3962e1bf400de0f"><div class="ttname"><a href="qstring_8c.html#a24dcde4b707ed664b3962e1bf400de0f">qstrcpy</a></div><div class="ttdeci">char * qstrcpy(char *dst, size_t size, const char *src)</div><div class="ttdoc">Copy src string to dst.</div><div class="ttdef"><b>Definition</b> <a href="qstring_8c_source.html#l00325">qstring.c:325</a></div></div>
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